If rod journal surfaces are smooth and show no taper, what should you do next?

When rod journal surfaces are smooth and exhibit no taper, the correct course of action is to install standard bearings in all rods. This implies that the rod journals are in good condition, indicating that they have been well-maintained and are within the specifications required for proper operation.

Standard bearings are designed to fit precisely on journal surfaces that maintain the appropriate diameter and finish, ensuring optimal engagement and minimal wear. Since the journals do not show signs of wear such as taper or scoring, using standard bearings allows for effective lubrication and shear between the rod and the crankshaft, leading to efficient engine performance.

Choosing to replace the crankshaft would be unnecessary and costly if the journals are already in excellent condition. Regrinding the journals is also not warranted since there are no issues such as wear or deformation that would require such a process. Measuring the rod length isn't directly relevant in this scenario, since the focus should be on the condition of the journal surfaces rather than the length of the rods at this stage.